Signaling system for railroad-trains.



s. T. STEWART.- SIGNALIN G SYSTEM PQR RAILBGAD TRAINS.

y APPLIFOATION FILED JAN. 31,1908* Patented oct. 27, 1908.

INVENTOR l IIIIHI'HHIIIU mo EY UNITED To all whom 'it mag/concern.' I.-

sHELLMAN fr; STEWART; or NEWARK;rravrfiaasnr-y mangiamo .sirs'rnu Fon nmoalnrnmsyg# Be itknown that I, SnELLMAN 'TSSTEWARL a citizen of the United States, resdiiigat Newi 'road-Trains, andfI lowing 'to be a full,clear, of the invention, such ark, in the county of Essex v.and State of New A, Jersey, have'invented certain new and useful "f b Improvements in Signaling Systems for Railo hereby declare the rfolas Willkenable others skilled inthe art to which it a pertains 1to make and use the samej-reference the accompanlying drawings, andftoffigures of referencemar ed thereon, 'which formfaparft g of this specification.

This invention relates to a systemof the"- -classj that emp loys an electrical circuitto show, when it 1s unbroken, that all the gates or doors of a railroad train are shut, since the lgates make and break the circuitwhen' the are closed and o ened. The closed circult operates an audib e or visual signal and indicates to the"engineer/or motorman that all;

(fates are shut, Without any manual manipulati'on of signals by the guards ortrainmen.

rEllis-system further 'embraces a secondcircuit that is made and broken by the motorman or engineer, and which acts to' unlock -v tram 1s at a the latches that hold shut the gates" that' make the first circuit. This system' insures all theatesbeing held shut until the ftiill stop and the motorman rcleases the latches of the gates.` The'bolts of -`is installed to complete; the 'circuit passing throu h the gates, `Where it is ,necessary to,y This circuiti passes through the gates land. returnsto the motor car or engine by means of a return the latches can be usedlto makes. connection with the gates to complete the i'rstcircuit.

The invention is illustratedin the accompanying drawing, in which Figure 1 is afdiagrammatic view vof the.

applied to a train, and Fig.v 2 1s a system as dia f t e preferred forniff latch vfor thetrain gates.

' I illustrate, in broken outline, the Acars 10, .Whch are supplied With-the usual gates `11 which are closed by theguards or traininen when the passengers are all aboardY The' gates l1 ac t to conduct electricalcurrent, 'and when shut complete a circuit which' passes through the Wires 12in each car, these wires connectingQthe` gatesof the car,A and a detachable'connection 13, of anyusual style,

cross rom one carto the next.

Wire 1 4, and'this return Wire enters the'conpeisngf'f benannten,

Epuration meenam s1, n. 41.30.3535

andexact description eing had to either audible or-vlsuaLfisin this and is suitably installedatofbe bygthe motormargf,

tches' arenotto he ram of thecirouits and showing a`detail- 23 betweerr the oars and1'beinvr att .hed'f'a one'end to the contact 24 ofrtrheifswitch' '116 and atthe other end to the Vwire 1,4V Which-1 the return Wire for both circuits.

` When the motorman throwsithefswiteh"16385 to y engage the contact 2 4, afterfthe; trai stops at `a station, lthemagnets26111293?back the bolts 21 and the atescanbe opencdvby ythe guards. :The b`ol21 is 'preferably heidi. normally in o erative 4position by gjfweightffii 25, butiany ind offelectrically",operatedz latch can be used in this system.` f

The benelits of this systemarenbeiousytrain 1s stopped and the responsibility the opening is placed. Again, :when thebell or signal circuit is closed by the switclrjl ,llitvwvr Shows atonce Whether the latches haveopf eratedor not.` A

'Having thus described my invention,1\ \l1at f Iclaimiskf- 1; A train-signal systelncomprisingv a cir i 'cuit, a signal therein, gates to [niae nini,

break the circuit, latches A.for locking'the gates shut, vand a second circuit te? operate the latches.'

2. A train-signal systemc'ompn'sin 'fa one', cuit, a signal-"therein, gates -t'o ma e and break 'the circuit,I ylatches for lo'ckingthe gatesshut, a circuit connsctingtheliatchs' Vand-havingone Vend connected to theretuni V'wire of the 'rstycircui-t, and manuallyfnpex i ated means as a switch for making the second l switch in the circuit, gates to nal circuit an either of lthe. circuits-complete,

circuit.

3. A tram-signal system comprising a circuit, a signal in the circuit, a two-contact switch in the circuit, gates to Amake and break the circuit, latches to`Y hold the gates normallyshut, and a second circuit connecting the latches and having its ends connected to the two-contact switch.

4. A train-signal system comprising a circuit, a signallm the circuit, a two-contact make and break the circuit, latches for locking` the gates, magnets adapted to operate'the latches v to release the gates, a second circuit connecting the magnets and being attached tothe two-contact switch whereby theljatches can be o` erated in unison, the si al circuit .being lma e'v by the switch when t `e second circuit is broken, and vice versa.

5. A train-signal system comprising a sigsecond circuit, the 'circuits having a common return Wire, manually operate'd meansn lthe return Wire for making a signal in the signal circuit, gates to make and break .the signal circuit, and electrically operated latches in the second circuit to normally hold the gates shut.

6. A train-signal system comprising a sigi nal circuit, a signal in the circuit, gates for making and breaking the circuit, a latch for each gate, a `bolt adapted to operate the latchto engage the gate to hold it shut and acting to contact with thel gate for making the signal circuit, means for normally holding the boltl in engagement with the gate, a

magnet in each ilatch and adapted to operate SHELLMAN Tfs'rEWART.

Witnesses WM. H. CAMFIELD,

E. A. PELL;

the bolt to release the gate, a second circult 

